// Do this as the first thing so that any code reading it knows the right env.
process.env.BABEL_ENV = 'development';
process.env.NODE_ENV = 'development';

// Makes the script crash on unhandled rejections instead of silently ignoring
// them. In the future, promise rejections that are not handled will terminate
// the Node.js process with a non-zero exit code.
process.on('unhandledRejection', err => {
  throw err;
});

// Ensure environment variables are read.
require('../config/env');

const fs = require('fs');
const chalk = require('chalk');
const webpack = require('webpack');
const WebpackDevServer = require('webpack-dev-server');
const clearConsole = require('react-dev-utils/clearConsole');
const checkRequiredFiles = require('react-dev-utils/checkRequiredFiles');
const {choosePort, createCompiler, prepareProxy, prepareUrls} = require('react-dev-utils/WebpackDevServerUtils');
const openBrowser = require('react-dev-utils/openBrowser');
const paths = require('../config/paths');
const config = require('../config/webpack.config.dev');
const createDevServerConfig = require('../config/webpackDevServer.config');

const useYarn = fs.existsSync(paths.yarnLockFile);
const isInteractive = process.stdout.isTTY;

// Warn and crash if required files are missing
if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
  process.exit(1);
}

// Tools like Cloud9 rely on this.
const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3001;
const HOST = process.env.HOST || '0.0.0.0';

// We attempt to use the default port but if it is busy, we offer the user to
// run on a different port. `detect()` Promise resolves to the next free port.
choosePort(HOST, DEFAULT_PORT).then(port => {
  if (port == null) {
    // We have not found a port.
    return;
  }
  const protocol = process.env.HTTPS === 'true'
    ? 'https'
    : 'http';
  const appName = require(paths.appPackageJson).name;
  const urls = prepareUrls(protocol, HOST, port);
  // Create a webpack compiler that is configured with custom messages.
  const compiler = createCompiler(webpack, config, appName, urls, useYarn);
  // Load proxy config
  const proxySetting = require(paths.appPackageJson).proxy;
  const proxyConfig = prepareProxy(proxySetting, paths.appPublic);
  // Serve webpack assets generated by the compiler over a web sever.
  const serverConfig = createDevServerConfig(proxyConfig, urls.lanUrlForConfig);
  const devServer = new WebpackDevServer(compiler, serverConfig);
  // Launch WebpackDevServer.
  devServer.listen(port, HOST, err => {
    if (err) {
      return console.log(err);
    }
    if (isInteractive) {
      clearConsole();
    }
    console.log(chalk.cyan('Starting the development server...\n'));
    // openBrowser(urls.localUrlForBrowser);
  });

  ['SIGINT', 'SIGTERM'].forEach(function (sig) {
    process
      .on(sig, function () {
        devServer.close();
        process.exit();
      });
  });
}).catch(err => {
  if (err && err.message) {
    console.log(err.message);
  }
  process.exit(1);
});
